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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8532e731ef89735e2e0d1c0b7e06de79bb7a3b211295f0320e134b6d541e56a1' 
  AND token = 'T8Oo/No1folUoiK9Ve1F7oKkLeF+dvmZdf2zqzgiW4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}